Is It A Tessellation Or Not?
Defining tessellation through examples
Is this a tessellation?
Webmaster Sethness's Opinion: It's a difficult decision, but I'm going to say YES.
If this is a picture of mushrooms, the answer is "NO"
because not everything on the page is mushrooms. There are unexplained, unoccupied spaces.
Therefore, there are gaps.
However, if we decide that the tiles are just big identical abstract shapes,
then it tessellates, yes.
What's important is that each tile is the same shape as the other tiles,
and they fit together without gaps or overlaps.